Question

The mobility of free electrons is greater than that of free holes because

• A. They carry negative charge
• B. They are light
• C. They mutually collide less
• D. They require high energy to continue their motion

Answer 1

The correct option is A They carry negative charge

The mass of an electron is significantly less than that of a hole therefore making it more mobile.

Moreover, $K.E=\frac{1}{2}m{v}^2$

Thus if the same energy is given to both, then electron will move faster than the hole because mass of electron is less than that of hole.